Support for mesos DockerInfo in fine-grained mode.

This patch adds partial support for running spark on mesos inside of a docker container. Only fine-grained mode is presently supported, and there is no checking done to ensure that the version of libmesos is recent enough to have a DockerInfo structure in the protobuf (other than pinning a mesos version in the pom.xml).
Should we fall through like this? 
I think we need to tell the user they have a wrong configuration